package demo1;


/*final*/ public class Test3 {
    protected int a = 1999;
}


class Student {

}
class Teacher {

}
class School {
    public Student[] students;//默认是null
    public Teacher[] teachers;

    public int a;

    public School() {
        this.students = new Student[10];
        this.teachers = new Teacher[10];
        this.a = 10;
    }
}